Datasheet

ManualsBrandsMAXIM INTEGRATED ManualsLinear ICsLinear IC - Audio amplifier 2-channel (stereo) Class D TDFN 14 EP (3x3)

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MAX98306

Stereo 3.7W Class D Amplifier

General Description

The MAX98306 stereo 3.7W Class D amplifier provides

Class AB audio performance with Class D efficiency.

This device offers five selectable gain settings (6dB,

9dB, 12dB, 15dB, and 18dB) set by a single gain-select

input (GAIN).

Active emissions limiting, edge-rate, and overshoot con-

trol circuitry combined with a filterless spread-spectrum

modulation scheme (SSM) provide excellent EMI perfor-

mance while eliminating the need for output filtering found

in traditional Class D devices. These features reduce

application component count.

The IC's 2.0mA quiescent current with a 3.7V supply

extends battery life in portable applications.

The IC is available in a 14-pin TDFN (3mm x 3mm x

0.75mm) package specified over the extended -40NC to

+85NC temperature range.

Applications

Features

S Output Power 3.7W at 3I, 10% THD, 1.7W at 8I,

10% THD, with 5V Supply

S Passes EMI Limit Unfiltered with Up to 12in of

Speaker Cable

S High 83dB PSRR at 217Hz

S Spread-Spectrum Modulation and Active

Emissions Limiting

S Five Pin-Selectable Gains

S Excellent Click-and-Pop Suppression

S Thermal and Overcurrent Protection

S Low-Current Shutdown Mode

S Space-Saving, 3mm x 3mm x 0.75mm,

14-Pin TDFN

19-5919; Rev 1; 8/11

+Denotes a lead(Pb)-free/RoHS-compliant package.

Ordering Information

Typical Application Circuit

Smartphones

Tablets

Cellular Phones

Accessory Speakers

MP3 Players

Portable Audio Players

VoIP Phones

EVALUATION KIT

AVAILABLE

INL+ OUTL+

OUTL-

OUTR-

OUTR+

INL-

INR-

INR+

GAIN GAIN

CONTROL

1µF

PVDD

PGND

SHDN

MAX98306

0.1µF

10µF

+2.6V TO +5.5V

PVDD

PART TEMP RANGE

PIN-

PACKAGE

TOP

MARK

MAX98306ETD+

-40NC to +85NC

14 TDFN +AEV

Summary of content (14 pages)

PAGE 1
9-5919; Rev 1; 8/11 TION KIT EVALUA BLE IL AVA A Stereo 3.7W Class D Amplifier Features The MAX98306 stereo 3.7W Class D amplifier provides Class AB audio performance with Class D efficiency. This device offers five selectable gain settings (6dB, 9dB, 12dB, 15dB, and 18dB) set by a single gain-select input (GAIN). S Output Power 3.7W at 3I, 10% THD, 1.
PAGE 2
MAX98306 Stereo 3.7W Class D Amplifier ABSOLUTE MAXIMUM RATINGS Voltage PVDD to PGND.....................................................-0.3V to +6V OUTL+, OUTR+, OUTL-, OUTRto PGND............................................-0.3V to (VPVDD + 0.3V) All Other Pins to PGND........................................-0.3V to +6V Current Continuous Current Into/Out of PVDD, PGND, OUTL+, OUTR+, OUTL-, OUTR-............................... ±800mA Continuous Input Current (all other pins).....................
PAGE 3
Stereo 3.7W Class D Amplifier (VPVDD = VSHDN = 3.7V, VPGND = 0V, AV = 12dB (GAIN = PVDD), RL = J, RL connected between OUT_+ to OUT_-, 20Hz to 22kHz AC measurement bandwidth, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25NC.) (Note 2) PARAMETER Click-and-Pop Level SYMBOL CONDITIONS KCP Peak voltage, TA = +25NC Into shutdown A-weighted, 32 samples Out of shutdown per second (Notes 3, 4) VPVDD = 2.6V to 5.
PAGE 4
ELECTRICAL CHARACTERISTICS (continued) (VPVDD = VSHDN = 3.7V, VPGND = 0V, AV = 12dB (GAIN = PVDD), RL = J, RL connected between OUT_+ to OUT_-, 20Hz to 22kHz AC measurement bandwidth, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25NC.) (Note 2) PARAMETER SYMBOL Signal-to-Noise Ratio Efficiency SNR E Oscillator Frequency fOSC CONDITIONS MIN TYP ZSPK = 8I +68FH, POUT at 1% THD+N 99 ZSPK = 8I +68FH, POUT = 1.
PAGE 5
Stereo 3.7W Class D Amplifier THD+N vs. FREQUENCY VPVDD = 5V ZLOAD = 3I + 22µH 10 THD+N vs. FREQUENCY 10 MAX98306 toc05 MAX98306 toc04 10 VPVDD = 3.7V ZLOAD = 8I + 68µH 1 MAX98306 toc06 THD+N vs. OUTPUT POWER 100 VPVDD = 5V ZLOAD = 8I + 68µH 1 0.1 700mW 0.1 1.3W 0.1 200mW 0.01 f = 1kHz 0.001 0.001 1.0 1.5 2.0 2.5 3.0 3.5 4.0 0.001 10 100 OUTPUT POWER (W) 10 MAX98306 toc07 10 100 2W 200mW 10k 100k OUTPUT POWER vs. LOAD RESISTANCE VPVDD = 5V ZLOAD = 3I + 22µH 2.5W 0.
PAGE 6
Typical Operating Characteristics (continued) (VPVDD = VSHDN = 5.0V, VPGND = 0V, AV = 12dB, RL = J, RL connected between OUT_+ to OUT_-, 20Hz to 22kHz AC measurement bandwidth, TA = +25NC, unless otherwise noted.) GAIN vs. FREQUENCY 2.5 2.0 0 -10 3.0 3.5 4.0 4.5 5.0 SUPPLY VOLTAGE (V) ZLOAD = 4I + 33µH 40 30 20 VPVDD = 5.0V 1.0 1.5 2.0 2.5 3.0 3.5 MAX98306 toc17 3.0 2.5 2.0 1.5 3.0 3.5 4.0 4.5 5.0 COMMON-MODE REJECTION RATIO vs. FREQUENCY POWER-SUPPLY REJECTION RATIO vs.
PAGE 7
Stereo 3.7W Class D Amplifier STARTUP RESPONSE IN-BAND vs. FREQUENCY MAX98306 toc22 0 AMPLITUDE (dB) -20 SHUTDOWN RESPONSE MAX98306 toc23 MAX98306 toc24 SHDN 2V/div -40 -60 SHDN 2V/div OUTL OUTL OUTR OUTR -80 -100 -120 -140 10 100 1k FREQUENCY (Hz) 10k 100k TIME (1ms/div) TIME (1ms/div) _______________________________________________________________________________________ 7 MAX98306 Typical Operating Characteristics (continued) (VPVDD = VSHDN = 5.
PAGE 8
Stereo 3.7W Class D Amplifier MAX98306 Pin Configuration OUTL- OUTL+ PVDD PVDD OUTR+ OUTR- PGND TOP VIEW 14 13 12 11 10 9 8 MAX98306 EP INL+ 5 6 7 INR+ SHDN 4 INR- 3 GAIN 2 INL- 1 PGND + TDFN Pin Description PIN NAME 1, 8 PGND Ground FUNCTION 2 SHDN Active-Low Shutdown Input. Drive SHDN to PGND to place the device into shutdown. Drive SHDN above 1.4V for normal operation.
PAGE 9
Stereo 3.7W Class D Amplifier The MAX98306 features low quiescent current, a lowpower shutdown mode, comprehensive click-and-pop suppression, and excellent RF immunity. The IC offers Class AB audio performance with Class D efficiency in a minimal board-space solution. The Class D amplifier features spread-spectrum modulation, active emissions limiting, edge-rate, and overshoot control circuitry that offers significant improvements to switch-mode amplifier radiated emissions. Table 1.
PAGE 10
MAX98306 Stereo 3.7W Class D Amplifier Applications Information Filterless Class D Operation Traditional Class D amplifiers require an output filter. The filter adds cost and size and decreases THD performance. The IC’s filterless modulation scheme does not require an output filter. Because the switching frequency of the IC is well beyond the bandwidth of most speakers, voice coil movement due to the switching frequency is very small. Use a speaker with a series inductance > 10FH.
PAGE 11
Stereo 3.7W Class D Amplifier 2.6V TO 5.5V 0.
PAGE 12
MAX98306 Stereo 3.7W Class D Amplifier Package Information For the latest package outline information and land patterns (footprints), go to www.maxim-ic.com/packages. Note that a “+”, “#”, or “-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the package regardless of RoHS status. PACKAGE TYPE PACKAGE CODE OUTLINE NO. LAND PATTERN NO. 14 TDFN T1433+2 21-0137 90-0063 COMMON DIMENSIONS PACKAGE VARIATIONS MIN. MAX.
PAGE 13
Stereo 3.7W Class D Amplifier COMMON DIMENSIONS PACKAGE VARIATIONS MIN. MAX. PKG. CODE N D2 E2 e JEDEC SPEC b A 0.70 0.80 T633-2 6 1.50±0.10 2.30±0.10 0.95 BSC MO229 / WEEA 0.40±0.05 1.90 REF D 2.90 3.10 T833-2 8 1.50±0.10 2.30±0.10 0.65 BSC MO229 / WEEC 0.30±0.05 1.95 REF E 2.90 3.10 T833-3 8 1.50±0.10 2.30±0.10 0.65 BSC MO229 / WEEC 0.30±0.05 1.95 REF 10 1.50±0.10 2.30±0.10 0.50 BSC MO229 / WEED-3 0.25±0.05 2.00 REF 2.00 REF SYMBOL A1 0.00 0.
PAGE 14
MAX98306 Stereo 3.7W Class D Amplifier Revision History REVISION NUMBER REVISION DATE 0 6/11 Initial release — 1 8/11 Updated output power in Electrical Characteristics 3 DESCRIPTION PAGES CHANGED Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.